REF 542plus switchbay protection and control unit
Manual Part 3: Installation and Commissioning
1VTA100004-en DMS,2001-10-04
REF542
plus
: Installation and Commissioning
63 / 80
ANSI Code
Protection Function and the Setting Parameters
Test Procedure
67N
Earth fault directional sensitive
IE> = 0,05 ... 2 In
t = 120 ... 100.000 ms, for- / backward
Slope angle
α
= 0 ... 20°,
Slope angle
δ
= - 180 ... 180°
UNE> = 0,05 ...0,7 Un
IEC 60255-12
51N
Earth fault IDMT
Standard, very, extremely or long time inverse time
characteristic,
Ie = 0,05 ... 40 In
k = 0,05 ... 1,5
IEC 60255-3
59 Overvoltage
instantaneous
U>>> = 0,10 ... 3 Un
t = 20 ... 300.000 ms
IEC 60255-3
59 Overvoltage
high
U>> = 0,10 ... 3 Un
t = 70 ... 300.000 ms
IEC 60255-3
59 Overvoltage
low
U> = 0,10 ... 3 Un
t = 70 ... 300.000 ms
IEC 60255-3
27 Undervoltage
instantaneous
U<<< = 0,10 ... 1,2 Un
t = 50 ... 300.000 ms
IEC 60255-3
27 Undervoltage
high
U<< = 0,1 ... 1,2 Un
t = 70 ... 300.000 ms
IEC 60255-3
27 Undervoltage
low
U< = 0,1 ... 1,2 Un
t = 70 ... 300.000 ms
IEC 60255-3
59N Residual
overvoltage
high
UNE>> = 0,05 ... 3 Un
t = 40 ... 300.000 ms
IEC 60255-3
59N Residual
overvoltage
low
UNE> = 0,05 ... 3 Un
t = 40 ... 300.000 ms
IEC 60255-3
49
Thermal overload protection (thermal equation 1
st
or-
der with complete memory function)
Tn = 50 ... 400 °C (nominal temperature at In)
In (Mot) = 1 ... 10000 A (primary value of the nominal
motorcurrent)
Tini = 50 ... 120 % Tn (initial temperature at power on)
τ
cool = 10 ... 20.000 s (time constant at I< 0.1 In and n
= 0)
τ
warm = 10 ... 20.000 s (time constant normal)
τ
warm = 10 ... 20.000 s (time constant at I > 2 In)
Tmax = 20 ... 400 °C (maximal temperature)
Twarn = 20 ... 400 °C (warn temperature)
Tenvi = 50 ... Tini (environment temperature)
IEC 60255-8
